Magnetic Loop Antennas
Welcome to the Website of G4TPH. If you are interested in portable QRP operating then on this website you will learn about the history of G4TPH, the development of the G4TPH Mag-loop, the specifications and how you can easily buy your own G4TPH Mag-loop.
New 100watt, Portable Magnetic Loop Antenna
I have now developed the ML-40HP portable Mag-loop antenna, the new 100 watt version of the successful ML-40 QRP antenna.
The ML-40HP mag loop antenna will handle 100 watts, weighs only 1.2kgs, tunes 40m thru 20m and is fully portable.
I originally developed the QRP portable Mag-loop antennas for my own use having bought a holiday apartment in Spain. The Portable QRP antennas received a tremendous welcome at Dayton earlier this year. However many hams that visited my stand asked if I did a 100 watt version of the model.
I came back to the UK and started work developing a portable 100 watt version of the ML-40 QRP Mag-loop.
The QRP Mag-loop antennas use a ferrite ring inductance loading unit. This was found not to be suitable for the higher power antenna thus the new ML-40HP uses gamma match loading.
The tuning of the ML-40HP is very critical so a tuning LED has been incorporated into the new design. When the LED lights the antenna is resonant on the transmitted frequency with a 1.5:1 or better SWR. The LED will not light if the SWR is higher than 2:1.
Like the QRP antennas the High power model does not need an ATU, counterpoise or ground.
Order the new ML-40HP online now.
Read Reviews of G4TPH Mag-loop Antennas:
Practical Wireless Magazine - February 2008